Propagation log: eight Aeonium head cuttings, taken at the wrong time on purpose
The standard advice is to take Aeonium cuttings in autumn. This batch was taken on 2 October 2026 — technically correct — but two of the eight were held at 26 °C instead of 20 °C to test the temperature sensitivity. Both failed.
Why Aeonium cuttings are temperature-critical
Aeonium roots only form in a narrow band, roughly 12–22 °C at the root zone, and above 24 °C the cutting enters the same dormancy response as the parent plant: stomata close, callus formation continues but root initiation stops. The cutting then sits for weeks with an intact callus and no roots, slowly consuming the stem.
Six of the eight heads in this batch were kept at 18–21 °C and rooted normally. The two kept at 25–27 °C callused in 8 days, showed no root initials at 40 days, and by day 55 had visibly shrunk. Both were discarded at day 60.
Timeline for the six that rooted
Heads were cut with 4–6 cm of stem on 2 October, and the leaves were left on — removing leaves to reduce transpiration is counterproductive on Aeonium, because the head needs them to photosynthesise while it roots. They were dried in shade at 18–20 °C for 8 days.
Set on dry 3–6 mm mineral mix on day 9, watered lightly at the rim on day 16, then every ten days. Root initials appeared at day 22–26 and firm resistance on a gentle tug at day 28–34. New leaf growth at the centre of the head began at day 45–58.
The leaf-removal question, answered
A side experiment used four extra heads with their leaves stripped back to the top six. All four rooted, but the median time to first root was 34 days versus 26 for the unstripped heads, and the stripped heads lost an average of 1.8 more leaves during the process.
The mechanism is straightforward: the head has no roots, so its only energy source is the leaves. Removing leaves removes the means of building roots, and the plant then also aborts the remaining leaves to reduce demand. Leave the head intact.
Result at ten weeks
Six of eight heads rooted and produced new centre growth (75 %), with root systems of 4–7 cm at week ten. All six were single heads at the start; two had branched into two heads by week twelve, which is a favourable outcome on a plant that would otherwise be a single stem.
The two failures are attributable entirely to temperature, not to timing or material. The lesson for anyone propagating Aeonium: measure the root-zone temperature, not the room temperature, and treat 24 °C as a firm ceiling.
Stage-by-stage numbers
| Stage | Day | What to look for |
|---|---|---|
| Leaf pulled | 0 | Petiole intact and the break is clean; dry, curved side up |
| Callus | 8 | The break seals and dries without blackening; still no water |
| Roots | 36 | Root tips past 5 mm; begin wetting the surrounding surface |
| Pup | 78 | Pup at 15 mm with its own stem base; ready to separate |
Stage comparison
Batch started 2 October 2026; 8 samples, 75% success.
Four things to take away
- Root initiation stops above about 24 °C at the root zone — 26 °C was a total loss.
- Dry the cut head 8 days in shade at 18–20 °C; roots in 28–34 days.
- Do not strip the leaves to reduce transpiration — they are the only energy source.
- 6 of 8 rooted; two failed purely on temperature, not on timing.
Informational only — This page is a cultivation record, not horticultural or plant-pathology advice. Any treatment should follow the product label and local regulation.